diff --git a/python/core/processing/qgsprocessingprovider.sip b/python/core/processing/qgsprocessingprovider.sip
index e0a279da5f8..390d2464748 100644
--- a/python/core/processing/qgsprocessingprovider.sip
+++ b/python/core/processing/qgsprocessingprovider.sip
@@ -31,6 +31,7 @@ class QgsProcessingProvider
 
     virtual ~QgsProcessingProvider();
 
+//     QgsProcessingProvider &operator=( const QgsProcessingProvider &other ) = delete;
 
     virtual QIcon icon() const;
 %Docstring
diff --git a/python/core/processing/qgsprocessingregistry.sip b/python/core/processing/qgsprocessingregistry.sip
index c9c37ff0359..fed08944438 100644
--- a/python/core/processing/qgsprocessingregistry.sip
+++ b/python/core/processing/qgsprocessingregistry.sip
@@ -33,6 +33,7 @@ class QgsProcessingRegistry : QObject
 
     ~QgsProcessingRegistry();
 
+//     QgsProcessingRegistry &operator=( const QgsProcessingRegistry &other ) = delete;
 
     QList<QgsProcessingProvider *> providers() const;
 %Docstring
diff --git a/python/core/qgsvectorlayer.sip b/python/core/qgsvectorlayer.sip
index 09da6c232a6..1f2ae8187c1 100644
--- a/python/core/qgsvectorlayer.sip
+++ b/python/core/qgsvectorlayer.sip
@@ -337,6 +337,7 @@ class QgsVectorLayer : QgsMapLayer, QgsExpressionContextGenerator
 
     virtual ~QgsVectorLayer();
 
+//     QgsVectorLayer &operator=( QgsVectorLayer const &rhs ) = delete;
 
     QString storageType() const;
 %Docstring
diff --git a/scripts/sipify.pl b/scripts/sipify.pl
index d2a4dd8a7c4..1699b8b88c4 100755
--- a/scripts/sipify.pl
+++ b/scripts/sipify.pl
@@ -53,6 +53,24 @@ while(!eof $header){
     $line = readline $header;
     #print $line;
 
+    if ($line =~ m/^\s*SIP_FEATURE\( (\w+) \)(.*)$/){
+        print "%Feature $1$2";
+        next;
+    }
+    if ($line =~ m/^\s*SIP_IF_FEATURE\( (\!?\w+) \)(.*)$/){
+        print "%If ($1)$2";
+        next;
+    }
+    if ($line =~ m/^\s*SIP_CONVERT_TO_SUBCLASS_CODE(.*)$/){
+        print "%ConvertToSubClassCode$1\n";
+        next;
+    }
+
+    if ($line =~ m/^\s*SIP_END(.*)$/){
+        print "%End$1";
+        next;
+    }
+
     # Skip preprocessor stuff
     if ($line =~ m/^\s*#/){
         if ( $line =~ m/^\s*#ifdef SIP_RUN/){
@@ -165,6 +183,12 @@ while(!eof $header){
         }
     }
 
+    # Skip assignment operator
+    if ( $line =~ m/operator=\s*\(/ ){
+        print "// $line";
+        next;
+    }
+
     # Detect comment block
     if ($line =~ m/^\s*\/\*/){
         do {no warnings 'uninitialized';
diff --git a/src/core/qgis.h b/src/core/qgis.h
index 845493c80a3..71d0e4f88dd 100644
--- a/src/core/qgis.h
+++ b/src/core/qgis.h
@@ -452,3 +452,23 @@ typedef unsigned long long qgssize;
  * http://pyqt.sourceforge.net/Docs/sip4/annotations.html?highlight=keepreference#function-annotation-ReleaseGIL
  */
 #define SIP_RELEASEGIL
+
+/**
+ * Will insert a `%Feature feature` directive in sip files
+ */
+#define SIP_FEATURE(feature)
+
+/**
+ * Will insert a `%If feature` directive in sip files
+ */
+#define SIP_IF_FEATURE(feature)
+
+/**
+ * Convert to subclass code
+ */
+#define SIP_CONVERT_TO_SUBCLASS_CODE(code)
+
+/**
+ * Will insert a `%End` directive in sip files
+ */
+#define SIP_END
diff --git a/tests/scripts/sipifyheader.expected.sip b/tests/scripts/sipifyheader.expected.sip
index ab79f1fcb30..053de89344f 100644
--- a/tests/scripts/sipifyheader.expected.sip
+++ b/tests/scripts/sipifyheader.expected.sip
@@ -48,6 +48,13 @@ class QgsSipifyHeader : QtClass<QVariant>
 
 %TypeHeaderCode
 #include "sipifyheader.h"
+%End
+
+%ConvertToSubClassCode
+    if ( sipCpp->headerType() == QgsSipifyHeader::Special )
+      sipType = sipType_QgsSpecialSipifyHeader;
+    else
+      sipType = sipType_QgsStandardSipifyHeader;
 %End
   public:
     enum MyEnum
@@ -80,6 +87,13 @@ A constructor with some special character types
     QgsSipifyHeader();
 %Docstring
 Default constructor
+%End
+
+//     QgsSipifyHeader &operator=( const QgsSipifyHeader other );
+
+    bool operator==( const QgsSipifyHeader other );
+%Docstring
+Comparison operator should be kept
 %End
 
     void multilineMethod( const QgsPoint &startPoint,
diff --git a/tests/scripts/sipifyheader.h b/tests/scripts/sipifyheader.h
index ff5c1e51d32..4187eb59e4b 100644
--- a/tests/scripts/sipifyheader.h
+++ b/tests/scripts/sipifyheader.h
@@ -82,6 +82,16 @@ typedef QVector<QVariant> QgsSuperClass;
  */
 class CORE_EXPORT QgsSipifyHeader : public QtClass<QVariant>, private QgsBaseClass
 {
+
+#ifdef SIP_RUN
+    SIP_CONVERT_TO_SUBCLASS_CODE
+    if ( sipCpp->headerType() == QgsSipifyHeader::Special )
+      sipType = sipType_QgsSpecialSipifyHeader;
+    else
+      sipType = sipType_QgsStandardSipifyHeader;
+    SIP_END
+#endif
+
   public:
     //! This is an enum
     enum MyEnum
@@ -114,6 +124,12 @@ class CORE_EXPORT QgsSipifyHeader : public QtClass<QVariant>, private QgsBaseCla
     //! Default constructor
     QgsSipifyHeader() = default;
 
+    //! Assignment operator should be removed in sip
+    QgsSipifyHeader &operator=( const QgsSipifyHeader other );
+
+    //! Comparison operator should be kept
+    bool operator==( const QgsSipifyHeader other );
+
     //! A multiline method signature
     void multilineMethod( const QgsPoint &startPoint,
                           QgsFeatureId featureId,